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Finding the Fourth Proportional to 68,388.40, 102,349.20 and 57,307.60

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Solution

The fourth proportional to 68,388.40, 102,349.20 and 57,307.60 is: 85,765.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,388.40 : 102,349.20 = 57,307.60 : x
  2. Step 2: Convert to fraction form
    68,388.40/102,349.20 = 57,307.60/x
  3. Step 3: Cross multiply
    68,388.40x = 102,349.20 × 57,307.60
  4. Step 4: Simplify right side
    68,388.40x = 5,865,387,013.92
  5. Step 5: Solve for x
    x = 5,865,387,013.92/68,388.40
  6. Step 6: Final answer
    x = 85,765.82

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.